igir/dist/packages/zip/src/fileRecord.js

🕹 A zero-setup ROM collection manager that sorts, filters, extracts or archives, patches, and reports on collections of any size on any OS.

import CP437Decoder from "./cp437Decoder.js";
import TimestampUtil from "./timestampUtil.js";
const CompressionMethod = {
  STORE: 0,
  SHRUNK: 1,
  REDUCED_FACTOR_1: 2,
  REDUCED_FACTOR_2: 3,
  REDUCED_FACTOR_3: 4,
  REDUCED_FACTOR_4: 5,
  IMPLODE: 6,
  DEFLATE: 8,
  DEFLATE64: 9,
  PKWARE_IMPLODE: 10,
  BZIP2: 12,
  LZMA: 14,
  IBM_CMPSC: 16,
  IBM_TERSE: 18,
  IBM_LZ77: 19,
  ZSTD_DEPRECATED: 20,
  ZSTD: 93,
  MP3: 94,
  XZ: 95,
  JPEG_VARIANT: 96,
  WAVPACK: 97,
  PPMD: 98,
  AE_X: 99
};
const CompressionMethodInverted = Object.fromEntries(
  Object.entries(CompressionMethod).map(([key, value]) => [value, key])
);
class FileRecord {
  raw;
  versionNeeded;
  generalPurposeBitFlag;
  compressionMethod;
  fileModificationTime;
  fileModificationDate;
  uncompressedCrc32;
  compressedSize;
  uncompressedSize;
  fileNameLength;
  extraFieldLength;
  fileName;
  extraFields;
  zip64ExtendedInformation;
  constructor(props) {
    this.raw = props.raw;
    this.versionNeeded = props.versionNeeded;
    this.generalPurposeBitFlag = props.generalPurposeBitFlag;
    this.compressionMethod = props.compressionMethod;
    this.fileModificationTime = props.fileModificationTime;
    this.fileModificationDate = props.fileModificationDate;
    this.uncompressedCrc32 = props.uncompressedCrc32;
    this.compressedSize = props.compressedSize;
    this.uncompressedSize = props.uncompressedSize;
    this.fileNameLength = props.fileNameLength;
    this.extraFieldLength = props.extraFieldLength;
    this.fileName = props.fileName;
    this.extraFields = props.extraFields;
    this.zip64ExtendedInformation = props.zip64ExtendedInformation;
  }
  /**
   * Return the file modification time, taking extra fields into account.
   */
  fileModificationResolved() {
    return TimestampUtil.parseNtfsExtraTimestamp(this.extraFields.get(10))?.modified ?? TimestampUtil.parseExtendedTimestamp(this.extraFields.get(21589))?.modified ?? TimestampUtil.parseUnixExtraTimestamp(this.extraFields.get(22613))?.modified ?? TimestampUtil.parseUnixExtraTimestamp(this.extraFields.get(13))?.modified ?? TimestampUtil.parseInfoZipMacintoshExtraTimestamp(this.extraFields.get(13133))?.modified ?? TimestampUtil.parseDOSTimestamp(this.fileModificationTime, this.fileModificationDate);
  }
  /**
   * Return the numerical CRC32.
   */
  uncompressedCrc32Number() {
    return this.uncompressedCrc32.readUInt32LE();
  }
  /**
   * Return the lowercased and padded CRC32 string
   */
  uncompressedCrc32String() {
    return this.uncompressedCrc32Number().toString(16).toLowerCase().padStart(8, "0");
  }
  /**
   * Return the compressed size, taking zip64 information into account.
   */
  compressedSizeResolved() {
    return this.zip64ExtendedInformation?.compressedSize ?? this.compressedSize - (this.isEncrypted() ? 12 : 0);
  }
  /**
   * Return the uncompressed size, taking zip64 information into account.
   */
  uncompressedSizeResolved() {
    return this.zip64ExtendedInformation?.uncompressedSize ?? this.uncompressedSize;
  }
  /**
   * Return the file name, taking extra fields into account.
   */
  fileNameResolved() {
    return (
      // Info-ZIP Unicode Path Extra Field
      this.extraFields.get(28789)?.subarray(5).toString("utf8") ?? (this.generalPurposeBitFlag & 2048 ? this.fileName.toString("utf8") : CP437Decoder.decode(this.fileName))
    );
  }
  /**
   * Return if this file is encrypted.
   */
  isEncrypted() {
    return (this.generalPurposeBitFlag & 1) !== 0;
  }
  /**
   * Return if this file has a data descriptor.
   */
  hasDataDescriptor() {
    return (this.generalPurposeBitFlag & 8) !== 0;
  }
  /**
   * Return if this file is a directory.
   */
  isDirectory() {
    return this.fileNameResolved().endsWith("/");
  }
}
export {
  CompressionMethod,
  CompressionMethodInverted,
  FileRecord as default
};
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